A new spectral ratio method using narrow band coda envelopes: Evidence for non-self-similarity in the Hector Mine sequence

Details A new spectral ratio method using narrow band coda envelopes: Evidence for non-self-similarity in the Hector Mine sequence A new spectral ratio method using narrow band coda envelopes: Evidence for non-self-similarity in the Hector Mine sequence

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3411303m&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 11, CiteID L11303

Computer Science

Performance

19

Seismology: Earthquake Source Observations (1240), Seismology: Earthquake Dynamics (1242), Seismology: Body Waves, Seismology: Earthquake Ground Motions And Engineering Seismology, Seismology: Seismic Monitoring And Test-Ban Treaty Verification

Scientific paper

The use of local and regional S-wave coda is shown to provide stable amplitude ratios that better constrains source differences between event pairs. We first compared amplitude ratio performance between local and near-regional S and coda waves in the San Francisco Bay region for moderate-sized events, then applied the coda spectral ratio method to the 1999 Hector Mine mainshock and its larger aftershocks. We find (1) average amplitude ratio standard deviations using coda are ~0.05 to 0.12, roughly a factor of 3 smaller than direct S-waves for 0.2 < f < 15.0 Hz; (2) coda spectral ratios for the M w 7.0 Hector Mine earthquake and its aftershocks show a clear departure from self-similarity, consistent with other studies using the same datasets; and (3) event-pairs (Green's function and target events) can be separated by ~25 km for coda amplitudes without any appreciable degradation, in sharp contrast to direct waves.

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